Substrate for display and liquid crystal display utilizing the same

ABSTRACT

The invention provides a substrate for a display which can be easily repaired even when there are problems such as inter-layer shorting attributable to invasion of static electricity. The substrate has a first wiring section disposed in a display area thereof and formed so as to outwardly extend from the inside of the display area. The substrate also has a second wiring section formed such that it intersects the first wiring section outside the display area on the substrate with an insulation film interposed between them. The substrate further has an opening formed in the second wiring section at least in a region thereof overlapping the first wiring section intersecting the same. Further, the substrate has overlapping portions formed at two ends of the opening where the first and second wiring sections overlap each other with the insulation film interposed between them.

This application is a Continuation of application Ser. No. 11/051,763,filed Feb. 4, 2005.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a substrate for a display and,particularly, to a substrate for a liquid crystal display having thinfilm transistors (hereinafter referred to as “TFTs”) as switchingelements which can be easily repaired for defects such as breakage andinter-layer shorting attributable static electricity generated atmanufacturing steps.

2. Description of the Related Art

Active matrix type liquid crystal displays are widely used as flat paneldisplays having high image quality in electronic apparatus such ascomputers and wide-screen television sets.

A liquid crystal display has an array substrate, an opposite substrateprovided opposite to the array substrate, and a liquid crystal layersealed between the array substrate and the opposite substrate. The arraysubstrate has a pixel electrode formed at each of a plurality of pixelregions and a TFT connected to each pixel electrode as a switchingelement. An opposite electrode is formed on an entire surface of theopposite substrate. The liquid crystal display is enabled for displayutilizing the liquid crystal by applying a voltage to the liquid crystallayer from the pixel electrodes and the opposite electrode.

FIG. 10 is a schematic view of apart of an array substrate taken on asurface of the substrate. As shown in the same figure, a plurality ofgate bus lines 1010 are disposed in parallel with each other on an arraysubstrate 1001, a scan signal for selecting pixel electrodes to bedriven being sequentially input to the gate bus lines. A plurality ofdrain bus lines 1020 to which a gradation signal is input are disposedon the array substrate 1001 substantially orthogonally to the pluralityof gate bus lines 1010.

A pixel region is constituted by each of rectangular regions defined inthe form of a matrix by the plurality of gate bus lines 1010 and theplurality of drain bus lines 1020 which are orthogonal to each other. Adisplay area (a) is constituted by an array of a plurality of such pixelregions. In each of the pixel regions, there is provided a TFT 1040, apixel electrode 1030 and a storage capacitor element (or storagecapacitor forming sections) 1050 for suppressing fluctuation of thepotential at the pixel electrode 1030.

A plurality of storage capacitor bus lines 1060 is disposed on the arraysubstrate 1001. The storage capacitor bus lines are formed in thehorizontal direction in the figure in parallel with the gate bus lines1010 in connection with the plurality of storage capacitor bus lines1050. A storage capacitor common electrode section 1070, which combinesthe plurality of storage capacitor bus lines 1060 and serves as a commonelectrode for them, is disposed on the array substrate 1001 such thatthey extend in the direction of intersecting the gate bus lines 1010(lengthwise direction in the figure). The storage capacitor commonelectrode section 1070 is formed on the gate bus lines 1010 with aninsulation film (not shown) interposed between them.

A plurality of connection terminal sections such as TAB terminals areprovided along each edge of the array substrate 1001. Predeterminedsignals are supplied to the gate bus lines 1010 and the drain bus lines1020 from the connection terminal sections.

The gate bus lines 1010 and the drain bus lines 1020 are basicallyvulnerable to static electricity because they are formed on a glasssubstrate having insulating properties. For example, when staticelectricity generated on the array substrate 1001 flows in through thegate bus lines 1010 at a manufacturing step (in the direction indicatedby the arrow El in the figure), it is discharged at regions where thegate bus lines 1010 and the storage capacitor common electrode section1070 overlap each other to cause inter-layer shorting S. Staticelectricity not only originates from charging that occurs when thesubstrate is peeled off from a stage during manufacture but also canenter the substrate from the outside.

A gate bus line 1010 having inter-layer shorting S is subjected to theproblem of line defects in the extending direction of the bus line,which results in a significant reduction in the yield of manufacture ofpanels. In particular, static electricity is likely to enter from theconnection terminal sections, and static electricity which has enteredin such a location can be discharged to a capacitor component that ispresent in its path to break down the capacitive section. In such acase, repair by using a laser beam must be performed to remove theshorting location S by cutting the gate bus line 1010, and the repairhas been virtually impossible.

The trend toward larger liquid crystal displays with higher definitionrequires, the wiring width of a storage capacitor common electrodesection 1070 to be great in order to reduce its resistance. As a result,since the surface area of overlapping regions where gate bus lines 1010and a storage capacitor common electrode section 1070 overlap, theproblem of the breakage of capacitive sections becomes more significant.

Patent Document 1: Japanese Unexamined Published Patent Application No.2003-156763

SUMMARY OF THE INVENTION

It is an object of the invention to provide a substrate for a displaywhich can be easily repaired even when it has problems such asinter-later shorting attributable to the invasion of static electricity.

The above-described object is achieved by a substrate for a displaycharacterized in that it includes a first wiring section formed suchthat it outwardly extends from the inside of a display area on asubstrate, a second wiring section formed such that it intersects thefirst wiring section outside the display area with an insulation filminterposed between them, an opening provided in the second wiringsection at least in a region thereof overlapping the first wiringsection intersecting the same, and overlapping portions formed at twoends of the opening where the first and second wiring sections overlapwith each other with the insulation film interposed between them.

According to the invention, since the plurality of overlapping portionhaving a redundant configuration is provided, even when an inter-layershorting defect attributable to static electricity occurs at the otheroverlapping portion, the path of conduction of the second wiring sectioncan be maintained by one of the overlapping portion, and the inter-layershorting defect can be easily repaired. The yield of manufacture cantherefore be improved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view schematically showing a general configuration of aliquid crystal display according to a first embodiment of the invention;

FIG. 2 shows an example of a configuration of a partial surface of asubstrate for a display according to the first embodiment of theinvention;

FIG. 3 shows an example of a configuration of a partial surface of asubstrate for a display according to a second embodiment of theinvention;

FIG. 4 shows an example of a configuration of a partial surface of asubstrate for a display according to a third embodiment of theinvention;

FIG. 5 shows an example of a configuration of a partial surface of asubstrate for a display according to a fourth embodiment of theinvention;

FIG. 6 shows an example of a configuration of a partial surface of asubstrate for a display according to a fifth embodiment of theinvention;

FIG. 7 shows an example of a configuration of a partial surface of asubstrate for a display according to a sixth embodiment of theinvention;

FIG. 8 shows an example of a configuration of a partial surface of asubstrate for a display according to a seventh embodiment of theinvention;

FIG. 9 shows an example of a configuration of a partial surface of asubstrate for a display according to an eighth embodiment of theinvention; and

FIG. 10 shows an example of a configuration of a partial surface of asubstrate for a display according to the related art.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Preferred embodiments of the invention will now be specificallydescribed with reference to the drawings.

First Embodiment (General Configuration)

First, a general configuration of a liquid crystal display utilizing asubstrate for a display according to the invention will be schematicallydescribed with reference to FIG. 1. FIG. 1 schematically shows a generalconfiguration of a liquid crystal display in the present embodiment, andit shows an array substrate of the liquid crystal display as viewed froma surface of the substrate.

The present embodiment represents a case in which storage capacitorcommon electrode sections are provided on two ends of an arraysubstrate, the embodiment being characterized in that openings areprovided at one of the two ends of the storage capacitor commonelectrode section in regions where the storage capacitor commonelectrode section intersects gate bus lines. A basic configuration ofthe liquid crystal display of the present embodiment will now bedescribed.

As shown in FIG. 1, the liquid crystal display of the present embodimentcomprises an array substrate (a substrate for a display) 1 having a TFTand a pixel electrode formed in each pixel region thereof, an oppositesubstrate 2 disposed opposite to the array substrate 1 and having colorfilters and an opposite electrode for forming a vertical electric fieldformed thereon, and a liquid crystal layer (not shown) sealed betweenthe array substrate 1 and the opposite substrate 2. A display area 3 isan area in which pixel electrodes (not shown) are arranged in thehorizontal and vertical directions.

As shown in FIG. 1, the array substrate 1 comprises gate bus lines(first bus lines) 10 for supplying a scan signal to each of the pixelelectrodes formed in the display area 3 at predetermined timing, aplurality of storage capacitor bus lines 60 connected to storagecapacitor elements for improving display quality by suppressingfluctuation of the potential at each of the pixel electrodes anddisposed such that they alternate with the gate bus lines 10 in paralleltherewith, a storage capacitor common electrode section (Cs commonelectrode) 70 connected to respective ones of the plurality of storagecapacitor bus lines 60 at one end thereof and formed at one end of thesubstrate to perform dual bank drive, a storage capacitor commonelectrode section 80 connected to respective ones of the plurality ofstorage capacitor bus lines 60 at one end thereof and formed at anotherend of the substrate, and drain bus lines (second bus lines), which arenot shown in FIG. 1, formed substantially orthogonally to the pluralityof gate bus lines 10 and the plurality of storage capacitor bus lines60, the drain bus lines supplying a gradation signal at predeterminedtiming.

The gate bus lines 10 correspond to a “first wiring section” accordingto the invention, and the storage capacitor common electrode section 70corresponds to a “second wiring section” according to the invention.However, this is not limiting the invention. The “first wiring section”according to the invention may include the gate bus lines 10 and thedrain bus lines (not shown in FIG. 1), and the “second wiring section”according to the invention may include the storage capacitor bus lines60 and the storage capacitor common electrode sections 70 and 80.

The array substrate 1 is formed greater than the opposite substrate 2,and two sides of the substrate 1 project beyond the opposite substrate 2to form regions for providing driving circuits. A plurality of gate TAB(Tape Automated Bonding) terminals (external connection terminals) 4that combine a plurality of the gate bus lines 10 are formed at an endla of one of the projecting regions, and a plurality of drain TABterminals (external connection terminals) 5 that combine a plurality ofthe drain bus lines are formed at an end 1 b of the other projectingregion.

Further, connection lines 6 a and 6 b extending from the storagecapacitor common electrode sections 70 and 80 are connected to the drainTAB terminals 5 located at two ends of the array substrate 1 in additionto drain bus lines.

Some of the plurality of gate bus lines 10 are connected to the gate TABterminals 4 by providing them with lead-out parts which are the portionsled out from the gate bus lines 10 in the state of bending and inclined.

The storage capacitor common electrode sections 70 and 80 are formed attwo ends of the substrate in order to cope with the cases in which thestorage capacitor bus lines 60 have a greater wiring length or in agreater quantity by supplying a voltage from both sides of the storagecapacitor bus lines 60.

The gate bus lines 10 and the storage capacitor common electrode section70 overlap each other with an insulation film interposed between them,and the storage capacitor common electrode section 70 is configured tohave openings in the overlapping regions. The configuration will bespecifically described below.

(Detailed Configuration of the Array Substrate 1 of the Embodiment)

A description will now be made with reference to FIG. 2 on a feature ofthe present embodiment, i.e., a specific configuration of the storagecapacitor common electrode section 70 of the array substrate 1. FIG. 2shows a configuration of the array substrate 1 of the active matrix typeliquid crystal display of the present embodiment on which pixelelectrodes are formed, FIG. 2 showing a plurality of pixel regions asviewed in a direction toward the surface of the substrate. FIG. 2 is anenlarged view of the part of FIG. 1 enclosed by the circle A in a brokenline. FIG. 2 does not illustrate the external connection terminals shownin FIG. 1.

As shown in FIG. 2, the array substrate 1 is formed with the pluralityof gate bus lines 10 (two of which are shown in FIG. 2) extending in thehorizontal direction of the figure in parallel with each other and theplurality of drain bus lines 20 (two of which are shown in FIG. 2)extending in the vertical direction in parallel with each other suchthat they are substantially orthogonal to the plurality of gate buslines 10.

The array substrate 1 is also formed with the pixel electrode 30 and theTFT (driving element) 40 disposed at each of intersections between theplurality of gate bus lines 10 and the plurality of drain bus lines 20and the storage capacitor element 50 disposed in association with eachof the pixel electrodes 30.

A storage capacitor element 50 includes a storage capacitor electrode(intermediate electrode) that is aligned with the center of the pixelelectrode 30 and connected to the same through a contact hole, aninsulation film formed under the storage capacitor electrode, and astorage capacitor opposite electrode part of a storage capacitor busline 60 formed under the insulation film, the part being a partial areaof the bus line facing the storage capacitor electrode. The storagecapacitor element 50 forms a storage capacitor one electrode of which isconstituted by the storage capacitor electrode and another electrode ofwhich is constituted by the storage capacitor opposite electrode part ofthe storage capacitor bus line 60.

On the array substrate 1, when each of the TFTs 40 is turned on, apredetermined potential is written at the pixel electrode 30 to controla voltage applied to the liquid crystal layer in the pixel region. Thevoltage applied to the liquid crystal layer must be maintained until thenext frame even if the TFT 40 is turned off. However, the potential atthe pixel electrode 30 fluctuates in one frame period due to a parasiticcapacitance generated at the TFT 40 or a leak current generated betweenthe pixel electrode 30 and the common electrode. For this reason, thevoltage applied to the liquid crystal layer is maintained for one frameby suppressing fluctuation of the potential at the pixel electrode 30with the storage capacitor element 50.

Some of the plurality of gate bus lines 10 have a bent part 11 which isbent such that it is inclined to be directed from the display area (a)toward a gate TAB terminal 4 (not shown in FIG. 2). The bent part 11 isformed over a width (b) of the storage capacitor common electrodesection 70. The gate TAB terminals 4 are formed in a region (c) outsidethe position where the storage capacitor common electrode section 70 isdisposed. Some gate bus lines 20 are not required to have the bent part11 to be connected with the gate TAB terminals 4 depending on theposition where the gate bus lines 20 are formed.

A storage capacitor bus line 60 is electrically connected to the storagecapacitor common electrode section 70 through a connection electrode 61and connection parts 62 a and 62 b.

The storage capacitor common electrode section 70 is stacked on the gatebus lines 10 in a position outside the display area (a) with aninsulation film (not shown) interposed between them, and it is formedwith openings 72 in regions where it overlaps the gate bus lines 10.

An opening 72 extends along the bent part 11 of a gate bus line 10. Thelength of the openings 72 is represented by L1. The length of thestorage capacitor common electrode section 70 from one end in the widthdirection thereof to one end of an opening 72 is represented by L2. Thelength of the storage capacitor common electrode section 70 from anotherend in the width direction thereof to another end of the opening 72 isrepresented by L3.

Thus, two overlapping portions 74 having the length L2 and L3,respectively, are formed for each gate bus line 10. An overlappingportion 74 includes the storage capacitor common electrode section 70,the insulation film formed under the storage capacitor common electrodesection 70 and the gate bus line 10 formed under the insulation film.

According to the related art, since a storage capacitor common electrodesection 70 is formed with no opening, when inter-layer shorting isrepaired by performing laser beam cutting, the conduction of the storagecapacitor common electrode section 70 is shut off. On the contrary, inthe case of the storage capacitor common electrode section 70 of thepresent embodiment, the provision of the openings 72 makes it possibleto form a redundant configuration in which at least two overlappingportions 74 are provided for each gate bus line 10. As a result, evenwhen there is a shorting part S in either of the overlapping portion 74,the path of conduction of the storage capacitor common electrode section70 can be maintained by the other overlapping portion 74. The yield ofmanufacture can be thus improved.

The openings 72 are formed with a length d that is slightly greater thanthe width of the gate bus lines 10 in the direction in which the storagecapacitor common electrode section 70 extends. There is no need forproviding openings in regions other than the regions overlapping thegate bus lines 10 because no inter-layer shorting can occur in suchregions. It is therefore possible to minimize the area of the openings72 and to provide the storage capacitor common electrode section 70 witha ladder structure that minimizes any unnecessary increase in theresistance of the storage capacitor common electrode section 70. Thestorage capacitor common electrode section 70 can therefore be formedsubstantially free of changes in resistance by such a ladder structure.

The length L1 of the openings 72 is preferably made as large aspossible, and the lengths L2 and L3 of the respective overlappingportion 74 are preferably made as short as possible. That is, areduction in the area of the overlaps between the gate bus lines 10 andthe storage capacitor common electrode section 70 allows capacitivecomponents associated with the gate bus lines 10 to be made small, andan additional effect can therefore be provided in that the waveform of agate pulse can be prevented from being rounded. In particular, thestorage capacitor common electrode section 70 must have a great linewidth in the range from 500 to 1500 μm, for example, at a resolutionequal to or higher than that according to XGA (1024×768). Even whenthere is such a requirement for the line width, the formation of theopenings 72 makes it possible to reduce capacitances, which form a partof capacitive components of the gate bus lines 10, in the regions wherethe gate bus lines overlap the storage capacitor common electrodesection 70, and the waveform of a gate pulse can be thus prevented frombeing rounded. Further, a repair can be easily performed when thelengths L2 and L3 of the overlapping portion 74 are small because ashorting part S formed in an overlapping portion 74 can be easily cutoff through laser beam cutting.

Gate electrodes of the TFTs 40, the gate bus lines 10 and the storagecapacitor bus lines 60 are formed in the same conductive layer (a firstconductive layer). Source electrodes and drain electrodes of the TFTs40, the drain bus lines 60 and the storage capacitor common electrodesection 70 are formed in the same conductive layer (a second conductivelayer). The pixel electrodes 30 and the connection electrodes 61 areformed in the same conductive layer (a third conductive layer). Aninsulation film is formed between each pair of the conductive layers toprevent shorting between the conductive layers.

(Method of Repairing Shorting part)

The liquid crystal display of the present embodiment has theabove-described configuration and operates as follows. First, let usassume that static electricity E1 generated at a step for manufacturingthe array substrate 1 enters the position where the storage capacitorcommon electrode section 70 is disposed through a gate bus line 10 fromthe side of the gate TAB terminals 4 outside the display area.

When the static electricity E1 enters, inter-layer shorting occurs, forexample, in a shorting part S at the overlapping portion 74 on the leftin FIG. 2. Then, in order to repair the shorting part S, an inspectionsuch as pattern recognition is performed to identify the shorting part.

Next, laser beam cutting is performed to cut the storage capacitorcommon electrode section 70 in cutting positions C1 and C2 at both endsof the shorting part S by irradiating the positions with a laser beam.At this time, since the overlapping portion 74 to be cut has a smalllength L2, it can be easily cut. By cutting the storage capacitor commonelectrode section 70 in the overlapping portion 74 as thus described,the storage capacitor common electrode section 70 and the gate bus line10 can be electrically isolated from each other in the shorting part S.

The inter-layer shorting can be thus repaired, and the array substrate 1will not become defective. The repair of the defect is thus completed.The repair involves no repair of the gate bus line 10.

In the redundant configuration formed by the two overlapping portion 74,even when there is a shorting part S in either of the overlappingportion 74 formed on the side of the gate TAB terminals 4, the path ofconduction of the storage capacitor common electrode section 70 can bemaintained at another overlapping portion 74.

As described above, in the present embodiment, two overlapping portions74 having a redundant configuration can be formed at the storagecapacitor common electrode section 70. As a result, even when aninter-layer shorting defect occurs on either of the overlapping portions74 due to static electricity generated at a manufacturing step, a repaircan be performed with the path of conduction of the storage capacitorcommon electrode section 70 maintained by the other overlapping portion74, which improves the yield of manufacture.

Further, the storage capacitor common electrode section 70 can be formedsuch that it undergoes substantially no change in resistance by formingthe openings 72 to provide the storage capacitor common electrodesection 70 with a ladder structure and making the area of the openings72 as small as possible.

Since the overlapping portion 74 have a small area, it is possible toreduce rounding of the waveform of a gate pulse flowing through the gatebus lines 10. In particular, the formation of the openings 72 makes itpossible to reduce waveform rounding even when a great line width isrequired. Further, a shorting part S formed at an overlapping portion 74can be easily cut off using laser beam cutting.

Furthermore, since no shorting can occur at the openings 72, shortingcan be limited to intersecting regions of the overlapping portion otherthan the openings. Thus, the scale of shorting (the area of a shoringregion) per bus line can be minimized.

When projecting regions for providing driving circuits are made small inorder to satisfy demand for a smaller frame, the wiring of the bentparts 11 of the gate bus lines 10 will be steeply inclined in someregions. Although this results in an increase in the area where thestorage capacitor common electrode section 70 overlaps the gate buslines 10, the formation of the openings 72 according to the presentembodiment makes it possible to reduce the area of the overlaps, therebysuppressing rounding of the waveform of a gate pulse.

In addition, the present embodiment can be carried out withoutincreasing the number of manufacturing steps because it different froman array substrate according to the related art only in theconfiguration of storage capacitor common electrode sections.

Second Embodiment

A second embodiment of the invention will now be described withreference to FIG. 3. In the following, features which have substantiallyidentical counterparts in the first embodiment will not be described,and the description will address areas in which changes are made only.FIG. 3 shows an example of a configuration of a part of a surface of asubstrate for a display according to the second embodiment of theinvention.

The above-described first embodiment employs a configuration in whichone opening 72 is disposed at the storage capacitor common electrodesection 70 for each gate bus line 10. The present embodiment employs aconfiguration in which redundancy is increased by providing a pluralityof openings, e.g., two openings 172 and 174 for each gate bus line 110to form three overlapping portions 176.

Specifically, as shown in FIG. 3, an array substrate 100 included in aliquid crystal display comprises gate bus lines 110, drain bus lines120, pixel electrodes 130, thin film transistors 140, storage capacitorbus lines 160 and a storage capacitor common electrode section 170similarly to the first embodiment.

The storage capacitor common electrode section 170 has two openings 172and 174 extending along a bent part 111 of each gate bus line 110 andthree overlapping portions 176. An opening width L3 of the opening 172and an opening width L6 of the opening 174 are substantially equal toeach other. Two of the overlapping portion 176 are formed with a widthL4 and a width L7, respectively, which are substantially equal, and theother overlapping portion 176 is formed with a width L5 which is greaterthan the widths L4 and L7.

The entire area of the two openings 172 and 174 is smaller than the areaof one opening 72 (FIG. 2) in the first embodiment. That is, the sum ofthe width L3 and the width L6 in FIG. 3 is smaller than the width L2 inFIG. 2.

In the array substrate 100 having the above-described configuration, thefollowing effects are provided when static electricity enters the samein the direction of the arrow E1. Specifically, when inter-layershorting occurs at a shorting part S, the periphery of the shorting partS is cut using a laser.

Since the openings 172 and 174 are formed, two out of three currentpaths are maintained even though one of the current paths is broken as aresult of laser beam cutting.

Further, inter-layer shorting may sequentially proceed in the enteringdirection E1 along the gate bus line 110. That is, shorting can occur ineach of the overlapping portion 176 having the width L4 and theoverlapping portion 176 having the width L5. In this case, since acurrent path can be maintained by the overlapping portion 176 having thewidth L7, the storage capacitor common electrode section 170 can be usedas it is even if each of the overlapping portion 176 having the width L4and the overlapping portion 176 having the width L5 is cut for repairusing laser beam cutting. As described above, in the present embodiment,the two openings 172 and 174 are provided to form three overlappingportions 176 where the storage capacitor common electrode section 170and the gate bus line 110 overlap each other. Thus, even when one or twoof the three current paths are broken as a result of laser beam cutting,the other current path can be maintained.

Third Embodiment

A third embodiment of the invention will now be described with referenceto FIG. 4. FIG. 4 shows an example of a configuration of a part of asurface of a substrate for a display according to the present embodimentof the invention. In the following, features which have substantiallyidentical counterparts in the first and second embodiments will not bedescribed, and the description will address areas in which changes aremade only.

The above-described first and second embodiments employ a configurationin which an opening 72 is formed along the extending direction of onegate bus line 10. The present embodiment employs a configuration inwhich openings 272 are formed in the extending direction of a storagecapacitor common electrode section 270.

Specifically, as shown in FIG. 4, an array substrate 200 of the presentembodiment comprises gate bus lines 210 having a bent part 211, drainbus lines 220, pixel electrodes 230, thin film transistors 240, storagecapacitor bus lines 260 and a storage capacitor common electrode section270 similarly to the first embodiment.

An elongate opening 272 in the storage capacitor common electrodesection 270 is formed such that it is longer in the extending directionof the storage capacitor common electrode section 270. A plurality ofthe openings 272, e.g., four openings 272 are formed and arranged in thedirection in which gate bus lines 210 extend. As a result, fiveoverlapping portions 274 are formed.

Such a configuration of the openings 272 provides the following effects.In the first and second embodiments, each of the openings 272 must beformed in accordance with the wiring pattern of a gate bus line 10. Onthe contrary, in the present embodiment, since the openings 272 in thestorage capacitor common electrode section 270 are formed as openingswhich are longer in the wiring extending direction of the storagecapacitor common electrode section 270, there is no need for redesigningthe storage capacitor common electrode section 270 even if a designchange is made to the wiring pattern of the gate bus lines 210.

For example, referring to the intervals between the gate bus lines 210arranged in parallel with each other, since the pitch of the lines in adisplay area is different from the pitch at which the lines are extendedfrom the display area and disposed on the side of external connectionterminals, it may be inevitable to form bent parts 211 in some regions.In this case, the inclination of each bent part is different for eachgate bus line 210. For this reason, it has been necessary in cases likethe first and second embodiments to vary the position and shape of eachopening 72 depending on the wiring pattern of the gate bus line 10,e.g., the inclination of the bent part 11 of the gate bus line 10. Thedesign of the openings 272 of the storage capacitor common electrodesection 270 can be simplified by forming them in an elongate shapeaccording to the present embodiment, which allows burdens associatedwith layout designing to be reduced.

In particular, in the case of a liquid crystal display panel havingnarrow projecting regions, the inclination of gate bus lines 210 may bevery steep compared to that in a liquid crystal display panel havingwide projecting regions. In such a case, since the elongate openings 272can be uniformly formed regardless of the layout of the gate bus lines210, the storage capacitor common electrode section 270 including theopenings 272 can be fabricated easily. Further, a repair can be easilycarried out in the case of inter-layer shorting.

Fourth Embodiment

A fourth embodiment of the invention will now be described withreference to FIG. 5. FIG. 5 shows an example of a configuration of apart of a surface of a substrate for a display according to the presentembodiment of the invention. In the following, features which havesubstantially identical counterparts in the first embodiment will not bedescribed, and the description will address areas in which changes aremade only.

The present embodiment employs a configuration in which a bypass wiring380 is disposed in the wiring direction of a storage capacitor commonelectrode section 370 such that they overlap each other with aninsulation film interposed between them. Specifically, as shown in FIG.5, an array substrate 300 of the present embodiment comprises gate buslines 310, drain bus lines 320, pixel electrodes 330, thin filmtransistors 340, storage capacitor bus lines 360, a storage capacitorcommon electrode section 370 and a bypass wiring 380. The bypass wiring380 corresponds to a “third wiring section” according to the invention.

The storage capacitor common electrode 370 has openings 372 opening inthe direction along the gate bus lines 310. As a result, two overlappingportions 374 are formed.

The bypass wiring 380 is formed in the wiring direction of the storagecapacitor common electrode section 370 across a plurality of theopenings 372 and formed above the storage capacitor common electrodesection 370 with an insulation film interposed.

Connection parts 382 and 384 electrically connect the bypass wiring 380and the storage capacitor common electrode section 370, and they areformed by fusing the storage capacitor common electrode section 380 byirradiating it with laser beams at a step of repairing the same.Referring to FIG. 5, for example, four connection parts 382 and 384 areformed in total for one opening 372. Thus, the bypass wiring 380 can beprovided with the same function as that of the storage capacitor commonelectrode section 370.

The above-described configuration of the array substrate 300 providesthe following effects. External static electricity does not necessarilyenter through the gate bus lines 310, and static electricity may flow infrom the side of drain TAB terminals (the upper side in FIG. 5) at oneend of the storage capacitor common electrode section 370 in the wiringdirection thereof as indicated by the arrow E2.

In such a case, inter-layer shorting may occur in a plurality oflocations, and shorting parts S1 and S2 appear in respective overlappingportions 374. Both of the shorting parts S1 and S2 are cut using laserbeam cutting, and the bypass wiring 380 is irradiated with laser beamsto form the connection parts 382 and 384.

As a result, a path of conduction can be maintained by the bypass wiring380 and the connection parts 382 and 384 even though both of theshorting parts S1 and S2 are cut using laser beam cutting to allow thestorage capacitor common electrode section 370 to be repaired.

In addition, the connection parts 382 and 384 can be easily formed atthe position irradiated with laser beams used for cutting the shortingparts S1 and S2 at the repairing step. The positions of the connectionparts 382 and 384 may be freely determined depending on positions whereshorting has occurred.

The bypass wiring 380 is preferably formed by patterning a transparentelectrode (ITO: Indium Tin Oxide) layer used as pixel electrodes on aninsulation film provided on the storage capacitor common electrodesection 370.

Outside a display area, the gate bus lines 310 (first layer), aninsulation film (second layer), the storage capacitor common electrodesection 370 (third layer), a second insulation film (fourth layer) andthe bypass wiring 380 (fifth layer) are stacked in the order listed on asubstrate having insulating properties. In a part of the display area(pixel regions), the storage capacitor bus lines 360 (first layer), aninsulation film (second layer), storage capacitor electrodes (thirdlayer), a second insulation film (fourth layer) and the pixel electrodes330 (fifth layer) are stacked in the order listed on the substratehaving insulating properties.

Thus, the bypass wiring 380 that is the fifth layer may be formed as thesame layer as the pixel electrodes 330 from the same material at thesame time. Therefore, the wiring can be provided using the same materialas that of the transparent electrode layer without forming it using adifferent material separately, which eliminates any need for anadditional process.

Even though the openings 372 are formed in the storage capacitor commonelectrode section 370, since the bypass wiring 380 is provided, the sumof the areas of the bypass wiring 380 and the storage capacitor commonelectrode section 370 allows resistance to be kept low.

Fifth Embodiment

A fifth embodiment of the invention will now be described with referenceto FIG. 6. FIG. 6 shows an example of a configuration of a part of asurface of a substrate for a display according to the present embodimentof the invention. In the following, features which have substantiallyidentical counterparts in the first through fourth embodiments will notbe described, and the description will address areas in which changesare made only.

The above-described fourth embodiment employs a configuration in whichone bypass wiring 380 is disposed on the storage capacitor commonelectrode section 370. The present embodiment employs a configuration inwhich a plurality of bypass wirings 480 is disposed on a storagecapacitor common electrode section 470. Specifically, as shown in FIG.6, an array substrate 400 of a liquid crystal display of the presentembodiment comprises gate bus lines 410, drain bus lines 420, pixelelectrodes 430, thin film transistors 440, storage capacitor bus lines460, a storage capacitor common electrode section 470 and a plurality ofbypass wirings 480 (three of which are shown in FIG. 6).

The storage capacitor common electrode section 470 has openings 472extending along the gate bus lines 410. Each of the plurality of bypasswirings 480 is formed along the wiring direction of the storagecapacitor common electrode section 470 such that it extents across theplurality of openings 472 to cover them, and the wirings are formedabove the storage capacitor common electrode section 470 with aninsulation film interposed between them.

The bypass wiring 480 in the middle is formed with connection parts 482and 484 which are electrically connected to the storage capacitor commonelectrode section 470. The connection parts 482 and 484 are formed byfusing the storage capacitor common electrode section 470 by irradiatingit with laser beams at a step of repairing the same. Two connectionparts 482 and 484 are formed in total on the bypass wiring 480 in themiddle.

On the array substrate 400 having the above-described configuration, thefollowing effects are provided. Static electricity can also enter in thewiring direction of the storage capacitor common electrode section 470from the side of external storage capacitor TAB terminals (the upperside in FIG. 6) as indicated by the arrow E2.

When inter-layer shorting occurs in two shorting parts S1 and S2 due tostatic electricity flowing in the direction E2, the bypass wirings 480maintains a path of conduction through the connection parts 482 and 484even if those parts are cut using laser beam cutting.

Inter-layer shorting attributable to the flow of static electricity fromthe gate bus lines 410 occurs not only in the shorting parts S1 and S2but also between the gate bus lines 410 and the bypass wirings 480because the openings 472 are formed in the storage capacitor commonelectrode section 470. Since the plurality of bypass wirings 480 areformed, the storage capacitor common electrode section 470 can be easilyrepaired also in such a case.

As described above, in the present embodiment, since the plurality ofbypass wirings 480 are formed, even when all of overlapping portions ofthe storage capacitor common electrode section 470 are shorted by a flowof static electricity in various directions, any of the plurality ofbypass wirings 480 can be used. Thus, the conduction of the storagecapacitor common electrode section 470 can be maintained, and the panelas a whole can be repaired only by repairing shorting parts andconnecting the bypass wirings 480 using laser beams.

Sixth Embodiment

A sixth embodiment of the invention will now be described with referenceto FIG. 7. FIG. 7 shows an example of a configuration of a part of asurface of a substrate for a display according to the present embodimentof the invention. In the following, features which have substantiallyidentical counterparts in the first through fifth embodiments will notbe described, and the description will address areas in which changesare made only.

The above-described fifth embodiment employs a configuration in whichlaser beam connection is performed as a process for electricallyconnecting the storage capacitor common electrode section 470 and theplurality of bypass wirings 480. The present embodiment employs aconfiguration in which contact holes are formed in advance.Specifically, as shown in FIG. 7, an array substrate 500 of a liquidcrystal display of the present embodiment comprises gate bus lines 510,drain bus lines 520, pixel electrodes 530, thin film transistors 540,storage capacitor bus lines 560, a storage capacitor common electrodesection 570 and a plurality of bypass wirings 580 (three wirings in theillustrated example).

The storage capacitor common electrode section 570 has openings 572 aand 572 b extending along the gate bus lines 510.

A plurality of the bypass wirings 580, e.g., three wirings are formedsuch that each of them extends in the wiring direction of the storagecapacitor common electrode section 570 across the plurality of openings572 a and 572 b and are stacked on the storage capacitor commonelectrode section 570 with a second insulation film interposed betweenthem.

The bypass wirings 580 are electrically connected to the storagecapacitor common electrode section 570 through connection parts 582,584, 585 and 586. Let us focus the description on one bypass wiring 580.A path of conduction is maintained for one opening 572 a by forming aconnection part 582 above the opening in the figure and anotherconnection part 584 under the opening, and a connection part 586 and aconnection part 588 are also formed for another opening 572 b above andunder the same in the figure. The three bypass wirings 580 are providedside by side for the single opening 572 a.

The connection parts 582, 584, 586 and 588 are electrically connected tothe bypass wirings 580 and the storage capacitor common electrodesection 570 through the contact holes formed by providing openings in aninsulation film which is not shown.

The present embodiment employs a configuration in which the plurality ofbypass wirings 580 and the storage capacitor common electrode section570 are connected in advance through the plurality of connection parts582, 584, 586 and 588 for each gate bus line 510.

Therefore, even when shorting occurs between one of the bypass wirings580 and the gate bus line 510 in addition to shorting parts S1 and S2attributable to the invasion of static electricity in respectivedirections, another bypass wiring 580 can be used. It is thereforepossible to maintain conduction of the storage capacitor commonelectrode section 570 using the other bypass wiring 580 and to therebyrepair the panel as a whole.

Since the area of the storage capacitor common electrode section 570includes the area of the bypass wirings 580, a reduction in resistancecan be achieved.

Further, since the layer thickness between the gate bus lines 510 andthe storage capacitor common electrode section 570 is different from thelayer thickness between the gate bus lines 510 and the bypass wirings580, the bypass wirings 580 can be made less vulnerable to staticelectricity, which is preferable in that inter-layer shorting isunlikely to occur between the bypass wirings 580 and the gate bus lines510. A configuration may alternatively employed, in which the thicknessof the film between the layers of the bypass wirings 580 and the storagecapacitor common electrode section 570 is increased.

Seventh Embodiment

A seventh embodiment of the invention will now be described withreference to FIG. 8. FIG. 8 shows an example of a configuration of apart of a surface of a substrate for a display according to the presentembodiment of the invention. In the following, features which havesubstantially identical counterparts in the first through sixthembodiments will not be described, and the description will addressareas in which changes are made only.

While the above-described first through sixth embodiments are configuredto facilitate a repair on inter-layer shorting between a gate bus line10 and a storage capacitor common electrode section 70, the presentembodiment addresses a case in which shorting occurs between an anti-ESD(electrostatic discharge) common electrode section 670 for combiningwirings for ESD protection section and a gate bus line 610.

FIG. 8 shows an example of a structure of Anti-ESD sections 620 forwhich an anti-ESD common electrode section 670 is formed. As shown inFIG. 8, an array substrate 600 has gate bus lines 610, ant-ESD sections620 connected to the gate bus lines 610 for preventing breakage of TFTsattributable to static electricity, and anti-ESD bus lines 660 formed soas to extend from the anti-ESD section 620.

Further, the array substrate 600 has the anti-ESD common electrodesection 670 at which the plurality of anti-ESD bus lines 660 arecombined. The anti-ESD common electrode section 670 is formed between adisplay area and gate TAB terminals (not shown) such that it extends ina direction across the gate bus lines 610 (the vertical direction in thefigure).

The gate bus lines 610 correspond to the “first wiring section”according to the invention, and the anti-ESD common electrode section670 corresponds to the “second wiring section” according to theinvention. However, this is not limiting the invention, and the “firstwiring section” according to the invention may include the gate buslines 10 and drain bus lines (not shown in FIG. 1), and the “secondwiring section” according to the invention may include the anti-ESD buslines 660 and the anti-ESD common electrode section 670, and the storagecapacitor bus lines 60 and the storage capacitor common electrodesections 70 and 80 in the first embodiment as well.

An anti-ESD section 620 is an anti-ESD circuit constituted by, forexample, a first TFT 622 that is a first switching element connected toa gate bus line 610, a second TFT 624 that is a second switching elementconnected to the gate bus line 610, and a third TFT 626 connected to thefirst TFT 622, the second TFT 624 and an anti-ESD bus line 660.

Gate electrodes G of the first through third TFTs 622, 624 and 626 areformed on a glass substrate at the same time when the gate bus lines 610and gate electrodes of TFTs in pixel regions are formed. The gateelectrodes G of the first and third TFTs 622 and 626 are formed so thatthey are electrically isolated from other wiring structures.

Source electrodes S and drain electrodes D of the first through thirdTFTs 622, 624 and 626 are formed simultaneously with the formation ofthe anti-ESD bus lines 660 and the anti-ESD common electrode section 670from the same material. The source electrode S of a first TFT 622 andthe source electrode S of a second TFT 624 are connected to the gate busline 610 associated therewith through contact holes 630 and 632,respectively. The source electrodes S and the drain electrodes D of thefirst and third TFTs 622 and 626 serve as conductors and form capacitiesin combination with the gate electrode G of the second TFT 624. Thedrain electrode D of the second TFT 624 and the drain electrode D of thethird TFT 626 are connected to the anti-ESD common electrode section 670through the anti-ESD bus line 660.

In the present embodiment, the first and third TFTs 622 and 626 areformed with channel lengths smaller than the channel length of thesecond TFT 624. As a result, when static electricity in the form of avery steep pulse voltage is generated on the gate bus line 610, thefirst TFT 622 or the third TFT 626 is broken before the second TFT 624is broken to protect the second TFT 624. Therefore, even when either ofthe first and third TFTs 622 and 626 is broken, since no direct shortingoccurs between the gate bus line 610 and the anti-ESD common electrodesection 670, no problem occurs at subsequent steps including a TFT test.

The channel widths of the first and third TFTs 622 and 626 are equal toeach other and are similar to the channel width of the second TFT 624.Therefore, the conductivity of the second TFT 624 is substantially thesame as the conductivity of the first and third TFTs 622 and 626 whichare regarded operating in series. Thus, a current associated forprotection against ESD can be shared between the second TFT 624 and thecombination of the first and third TFTs 622 and 626.

The anti-ESD common electrode section 670 is formed above the gate buslines 610 with an insulation film (not shown) interposed between them.As shown in FIG. 8, the anti-ESD common electrode section 670 hasopenings 672 which are formed along bent parts 611 of the gate bus lines610 in regions thereof overlapping the gate bus lines 610.

One opening 672 is formed for each gate bus line 610, and overlappingportions 674 are formed on two edges of an opening 672.

On the array substrate 600 having the above-described configuration,when static electricity E1 flows in from the outside of a gate bus line610, inter-layer shorting occurs between the anti-ESD common electrodesection 670 and the gate bus line 610 in a shorting part S.

The inter-layer shorting can be repaired by cutting the anti-ESD commonelectrode section 670 in cutting positions C1 and C2 on both sides ofthe shorting part S using laser beams. Even though one of theoverlapping portions 674 is thus cut off, a path of conduction can bemaintained by the other overlapping portion 674. Therefore, the anti-ESDcommon electrode section 670 can be easily repaired. At this time, norepair is required for the gate bus line 610.

As thus described, a repair can be facilitated by employing aconfiguration in which openings 672 are formed not only in a commonwiring section as described in each of the above embodiments but also inregions of an anti-ESD common electrode section 670 that overlap gatebus lines 610, the electrode section 670 combining anti-ESD bus lines660 connected to anti-ESD sections (anti-ESD circuits or anti-ESDelements) 620 for preventing ESD on the gate bus lines 610.

While the present embodiment employs a configuration in which theanti-ESD sections 620 are formed on the gate bus lines 610, aconfiguration may be employed in which the anti-ESD sections 620 aredisposed on drain bus lines (not shown). It is obviously possible toemploy a configuration in which the anti-ESD sections 620 are disposedon each of the gate bus lines 610 and drain bus lines. Openings may beprovided on the anti-ESD common electrode section 670 when the anti-ESDcommon electrode section 670 is configured as a common line for thedrain bus lines.

While the above-described structure of an anti-ESD circuit is used in aliquid crystal display having channel-etching type TFTs formed in pixelregions thereof, this is not limiting the invention, and anti-ESDcircuits according to the present embodiment may be used in a liquidcrystal display having etching-stopper type TFTs. In addition, first andsecond resistors may be formed instead of the first TFT 622 and thethird TFT 626.

The anti-ESD sections 620 are not limited to the anti-ESD circuitsdisclosed in the present embodiment, and they may be constituted byanti-ESD elements. In this case, a common wiring section is provided, inwhich bus lines are electrically connected to each other through highresistance elements to disperse a current flowing through one bus line.Since the common wiring overlaps the gate or drain bus lines, anelectrode can be repaired by cutting a part of either of overlappingportions thereof in the same way as in the first and second embodiments.

A set of anti-ESD sections 620 may be formed on each bus line, andelements formed at the anti-ESD sections 620 may be used on a sharedbasis as much as possible to reduce the total number of the elements.Such an arrangement makes it possible to reduce the failure rate of theconstituent elements, the area occupied by the elements and the numberof the constituent elements.

Eighth Embodiment

An eighth embodiment of the invention will now be described withreference to FIG. 9. FIG. 9 shows an example of a configuration of apart of a surface of a substrate for a display according to the presentembodiment of the invention. In the following, features which havesubstantially identical counterparts in the first embodiment will not bedescribed, and the description will address areas in which changes aremade only.

The above-described first through sixth embodiments are configured tofacilitate a repair on inter-layer shorting between a gate bus line 10and a storage capacitor common electrode section 70. The presentembodiment provides a configuration to be used for an electrode sectionof an IPS (In-Plane Switching) type (horizontal electric field type)liquid crystal display, in which opposite electrodes for forminghorizontal electric fields (that are different from opposite electrodesfor forming vertical electric fields on an opposite substrate of a TN orVA type display) formed on an array substrate 700 (other than pixelelectrodes, and source electrodes, gate electrodes and drain electrodesof TFTs, and storage capacitor electrodes) are combined.

The horizontal electronic field type liquid crystal display comprises anarray substrate 700 (a substrate for a display) formed with TFTs, pixelelectrodes and opposite electrodes for forming horizontal electricfields and the like for each pixel region, an opposite substrate (notshown) provided opposite to the array substrate 700 and a liquid crystallayer (not shown) sealed between the array substrate 700 and theopposite substrate. A display area is formed by the pixel electrodes 730and opposite electrodes 750 for forming horizontal electric fields whichare arranged in a comb-type configuration opposite to each other.

FIG. 9 shows a surface of an array substrate of a horizontal electricfield type liquid crystal display as viewed from the side of the liquidcrystal layer thereof. In FIG. 9, the region of external connectionterminals of gate bus lines is partially omitted to show a neighborhoodof a display area only.

Specifically, an array substrate 700 is used in a horizontal electricfield type liquid crystal display and, as shown in FIG. 9, it has aplurality of gate bus lines 710 (first bus lines) and a plurality ofdrain bus lines 720 (second bus lines) which are orthogonal to eachother and a source electrode of a TFT 740 and a pixel electrode 730provided at each of intersections between the plurality of gate buslines 710 and the plurality of drain bus lines 720.

Further, the array substrate 700 comprises an opposite electrode 750 forforming horizontal electric fields which is provided in association witheach of the pixel electrodes 730 for forming a horizontal electric fieldbetween the pixel electrode 730 and itself, a plurality of oppositeelectrode bus lines (third bus lines) 760 connected to respectiveopposite electrode 750 for forming horizontal electric fields and formedbetween respective gate bus lines 710, and a common electrode section770 for opposite electrodes serving as a combining section at which theplurality of opposite electrode bus lines 760 are combined.

The gate bus lines 710 correspond to the “first wiring section”according to the invention, and the common electrode section 770 foropposite electrodes corresponds to the “second wiring section” accordingto the invention. However, this is not limiting the invention, and the“first wiring section” according to the invention may include the gatebus lines 710 and the drain bus lines 720, and the “second wiringsection” according to the invention may include the storage capacitorbus lines, the storage capacitor common electrode section, the anti-ESDbus lines and the anti-ESD common wiring section in the above-describedembodiments.

As shown in FIG. 9, the drain bus lines 720 are formed such that theyextend in the vertical direction in the figure, and gradation signalsare supplied to them. The gate bus lines 710 are formed such that theyextend in the horizontal direction in the figure orthogonally to thedrain bus lines 720, and scan signals are supplied to them. Pixelregions are defined by the drain bus lines 720 and the gate bus lines710.

An external connection terminal (not shown) is provided at one end ofeach drain bus line 720 for electrical connection with an externalelement. Similarly, an external connection terminal is provided at oneend of each gate bus line 710 for electrical connection with an externalelement.

The TFTs 740 are formed, for example, in a channel-etched typeconfiguration in the vicinity of intersections between the drain buslines 720 and the gate bus lines 710. A drain electrode of a TFT 740 isextended from the drain bus line 720 associated therewith and formedsuch that the end of the same is located at one edge of an activesemiconductor layer (not shown) above the gate bus line 710 associatedtherewith. A source electrode of the TFT 740 is formed at another edgeof the active semiconductor layer such that it faces the drainelectrode. In such a configuration, a region of the gate bus line 710located directly under the active semiconductor layer serves as a gateelectrode of the TFT 740.

Although not shown, a gate insulation film is formed on a gate bus line710, and an active semiconductor layer constituting a channel is formedon the gate insulation film. The active semiconductor layer is formedabove the gate bus line 710 so as to extend along the gate bus line 710and is electrically isolated from the active semiconductor layer of theTFT in another pixel region adjacent to the same. The TFT structureshown in FIG. 9 has a configuration in which a straightly formed part ofa gate bus line 710 is used as a gate electrode instead of forming thegate electrode as an extension of the gate bus line 710.

A pixel electrode 730 is formed with a first convexo-concave sectionwhich is directly extended from the source electrode of the associatedTFT 740 into the pixel region and which is substantially in the form ofcomb-teeth extending downward in the figure.

A horizontal electric field forming opposite electrode 750 is formedwith a second convexo-concave section which is formed in the associatedpixel region on the array substrate 700 and which is substantially inthe form of comb-teeth extending upward and downward in the figure so asto match the first convexo-concave section of the pixel electrode 730.

Since electric fields are applied to a liquid crystal layer in thehorizontal direction according to the IPS method, the horizontal fieldforming opposite electrodes 750 are provided on the array substrate 700along with the pixel electrodes 730, and the gate electrodes, the drainelectrodes and the source electrodes of the TFTs 740. Horizontalelectric fields are formed by the pixel electrodes 730 and thehorizontal electric field forming opposite electrodes 750.

The horizontal electric field forming opposite electrodes 750 areopposite electrodes according to the IPS method and are different fromthe opposite electrodes (vertical field forming opposite electrodes) onthe opposite substrate according to the vertical electric field method(TN method or VA method) in the first through seventh embodiments.

In the pixel configuration that is commonly used in the IPS method shownin FIG. 9, the horizontal field forming opposite electrodes 750 areformed in parallel with the pixel electrodes 730 at an appropriateinterval from the same.

The opposite electrode bus lines 760 are connected to the respectivehorizontal electric field forming opposite electrodes 750 and areprovided in parallel with the gate bus lines 710. The opposite electrodebus lines 760 extend to an external electrode section constituting thecommon electrode section 770 which is the opposite electrodes combinedoutside the display area and to which a predetermined potential isapplied. Therefore, the common electrode section 770 for the oppositeelectrodes thus combined intersects extensions of the gate bus lines710.

The common electrode section 770 for the opposite electrodes is formedabove the gate bus lines 710 with an insulation film (not shown)interposed between them and is formed with openings 772 in regionsthereof overlapping the gate bus lines 710. The openings 772 extendalong bent parts 711 of the gate bus lines 710. Therefore, overlappingportions 774 overlapping the gate bus lines 710 are formed.

On the array substrate 700 having the above-described configuration,when static electricity E1 flows in from the side of a gate TAB terminalfor a gate bus lines 710, inter-layer shorting occurs between the commonelectrode section 770 for the opposite electrodes and the gate bus line710 in a shorting part S. The reason is that one of the two overlappingportions 774 overlaps the gate bus line 710.

The inter-layer shorting can be repaired by cutting the common electrodesection 770 for the opposite electrodes in cutting positions C1 and C2on both sides of the shorting part S using laser beams. Even though oneof the overlapping portions 774 is thus cut off, a path of conductioncan be maintained by the other overlapping portion 774. Therefore, thecommon electrode section 770 for the opposite electrodes can be easilyrepaired. At this time, no repair utilizing laser beam cutting isrequired for the gate bus line 710.

As thus described, the configuration of the openings can be used notonly in a common electrode as described in each of the above embodimentsbut also on an array substrate according to the IPS mode. Theconfiguration may be used also in a common wiring section for oppositeelectrodes at which bus lines connected to opposite electrodes forforming horizontal electric fields are combined. A repair can thereforebe easily carried out on a substrate for an IPS display with the sameeffects as those in the first embodiment provided.

[Modifications]

While substrates for a display and liquid crystal displays utilizing thesame according to the invention have been described with reference toseveral specific embodiments thereof, each of the embodiments may bemodified in various ways.

For example, the above description of embodiments have addressedrelationships between a gate bus line and a storage capacitor commonelectrode section, between a gate bus line and a common electrodesection for opposite electrodes and between a gate bus line and a commonelectrode section for protection against ESD. The same techniques mayobviously be used between a drain bus line and a storage capacitorcommon electrode section, between a drain bus line and a commonelectrode section for opposite electrodes and between a drain bus lineand a common electrode section for protection against ESD.

Further, although the second embodiment employs a configuration in whichtwo openings are provided for each gate bus line, three or more openingsmay be provided. In this case, static electricity from a gate bus linemay enter from the side of external connection terminals to sequentiallycause inter-layer shorting at a first overlapping portion between afirst opening and an edge and at a second overlapping portion between asecond opening and the first opening. In such a case, conduction can bemaintained by a third overlapping portion between the second and thirdopenings and a fourth overlapping portion between the third opening andanother edge even if the first and second overlapping portions are cutusing laser beams, and it is therefore possible to repair the liquidcrystal display panel as a whole more easily.

Further, while the first through sixth embodiments employ configurationsin which storage capacitor common electrode sections are disposed on twoends of an array substrate, a configuration may be employed, in whichthe storage capacitor common electrode section is disposed on one endonly.

Obviously, the ESD feature in the seventh embodiment and the commonelectrode section for combining lines having an IPS-based configurationin the eighth embodiment may be adopted in the configuration of thecommon electrode section described in any of the first through sixthembodiments (e.g., the shape of the openings and the bypass wirings).

An array substrate may have a configuration in which an anti-ESD commonelectrode section having openings according to the seventh embodiment isprovided in addition to a storage capacitor common electrode sectionaccording to any of the first through sixth embodiment. Further, anarray substrate may have a configuration in which an anti-ESD commonelectrode section having openings according to the seventh embodiment isadded to a storage capacitor common electrode section formed with noopening. An array substrate may have a configuration in which a commonelectrode section for opposite electrodes having openings according tothe eighth embodiment is provided in addition to a storage capacitorcommon electrode section according to any of the first through sixthembodiments. An array substrate may have a configuration in which acommon electrode section for opposite electrodes having openingsaccording to the eighth embodiment is added to a storage capacitorcommon electrode section formed with no opening.

Furthermore, an array substrate may have a configuration in which bothof an anti-ESD common electrode section having openings according to theseventh embodiment and a common electrode section for oppositeelectrodes having openings according to the eighth embodiment areprovided in addition to a storage capacitor common electrode sectionaccording to any of the first through sixth embodiments. In this case,the configuration of the common electrode section in any of the firstthrough sixth embodiments may be adopted for the anti-ESD commonelectrode section and the common electrode section for oppositeelectrodes. A configuration may alternatively be employed in which noopening is provided on any of the storage capacitor common electrodesection, the anti-ESD common electrode section and the common electrodesection for opposite electrodes.

Furthermore, a configuration may be employed, in which one common wiringsection extending across gate bus lines has the configuration in any ofthe first through sixth embodiment and in which another common wiringsection extending across drain bus lines has the configuration in any ofthe first through sixth embodiments. Such a configuration may includethe feature for protection against ESD in the seventh embodiment and thecommon electrode for combining lines having an IPS-based configurationin the eighth embodiment. In addition, openings or bypass wirings havingan ESD configuration or an IPS-based configuration may be formed.

Although TAB terminals are provided as external connection terminals inthe above-described embodiments, COG (Chip On Glass) type configurationmay alternatively be employed. In this case, an IC chip connected to theexternal connection terminals is preferably formed in advance at thesame process at which the array substrate is manufactured.

Further, it is preferable that a plurality of TCPs (Tape CarrierPackages) carrying driver ICs for driving gate bus lines are mounted onthe left side of an exposed picture-frame area of an array substrate. Itis also preferable that a plurality of TCPs carrying driver ICs fordriving drain bus lines are mounted on the upper exposed area of thearray substrate 1 in the figure. The plurality of TCPs are connected toa peripheral circuit substrate (not shown).

At the four corners of an array substrate, there is preferably providedtransfer formation regions which are electrically connected to oppositeelectrodes for forming vertical electric fields formed on an oppositesubstrate through a transfer portion when the array substrate iscombined with the opposite substrate. In this case, each of the transferformation regions is preferably formed with a connection pad constitutedby a lower electrode formed of, for example, the same material as thatof storage capacitor bus lines and an upper electrode formed of the samematerial as that of pixel electrodes. It is desirable that theconnection pads are electrically connected to the storage capacitorcommon wiring section and that the transfer formation regions areprovided in the vicinity of at least a pair of diagonal corners of thearray substrate or in the vicinity of at least both ends of one side ofthe array substrate in the direction in which the gate bus lines extend.Alternatively, a greater number of transfer formation regions maybesubstantially uniformly provided, for example, around the display area.

In addition, the invention is not limited to the above-describedembodiments and may be modified in various ways. For example, activematrix type liquid crystal displays utilizing TFTs as switching elementshave been described by way of example in the above embodiments. However,the invention is not limited to them and may be applied to substratesfor various types of displays including active matrix type liquidcrystal displays utilizing non-linear elements such as diode elements(MIM), passive type liquid crystal displays, EL (Electro-Luminescence)displays, PDPs (Plasma Displays) and the like.

Substrates for a display as described above maybe used in various typesof liquid crystal displays. In this case, the liquid crystal displayscomprise driver circuits, the driver circuits driving the liquid crystaldisplays and including a power supply circuit, a display informationprocessing circuit and an inspection circuit used for inspections aftermanufacture, in addition to a gate line driving circuit and a drain linedriving circuit. The display information processing circuit processesand outputs display information, and it may include, for example, anamplification/polarity inversion circuit, a phase developing circuit, arotation circuit, a gamma control circuit and a clamp circuit.

Further, the above-described embodiments include various stages ofimplementation, and various modifications can be made by appropriatelycombining a plurality of the constituent features disclosed. That is,the invention obviously includes any embodiment that is a combination ofthe above-described embodiments or a combination of any of theembodiments and any of the modifications thereof. It is obvious thatsuch an embodiment can also provide the same effects as those which arereadily understood from the features disclosed in the embodiments andthe modifications, although not described in the embodiments. Aconfiguration may be employed in which some of the constituent featuresof the embodiments are deleted.

The above description has only disclosed some exemplary embodiments ofthe invention which may be appropriately altered or modified within apredetermined range. The embodiments merely shows examples and do notplace any limitation on the invention.

1. A substrate for a display comprising: a first wiring section formedso as to outwardly extend from the inside of a display area on asubstrate; a second wiring section formed so as to intersect the firstwiring section outside the display area with an insulation filminterposed between them; an opening formed in the second wiring sectionat least in a region thereof overlapping the first wiring sectionintersecting the second wiring section; and overlapping portions formedat two ends of the opening where the first and second wiring sectionsoverlap each other with the insulation film interposed between them. 2.A substrate for a display according to claim 1, wherein the opening isformed in the direction in which the first wiring section extends.
 3. Asubstrate for a display according to claim 1, wherein the opening isformed in the direction in which the second wiring section extends.
 4. Asubstrate for a display according to claim 2, wherein a plurality of theopenings is formed.
 5. A substrate for a display according to claim 3,wherein a plurality of the openings is formed.
 6. A substrate for adisplay according to claim 1, further comprising a third wiring sectionformed across the opening and stacked on the second wiring section witha second insulation film interposed therebetween.
 7. A substrate for adisplay according to claim 6, wherein the third wiring section has aconnection part electrically connected to the second wiring section. 8.A substrate for a display according to claim 6, wherein a plurality ofthe third wiring sections are formed.
 9. A substrate for a displayaccording to claim 1, wherein the second wiring section comprises astorage capacitor common electrode section commonly connected to each ofa plurality of storage capacitor elements formed in the display area.10. A substrate for a display according to claim 1, further comprising aplurality of anti-ESD sections disposed on the substrate and connectedto respective bus lines constituting the first wiring section, whereinthe second wiring section comprises one anti-ESD common wiring sectionwhich is commonly connected to each of the plurality of anti-ESDsections.
 11. A substrate for a display according to claim 1, furthercomprising a horizontal electric field forming opposite electrodedisposed for forming a horizontal electric field between a pixelelectrode in the display area and itself and formed in association withthe pixel electrode, wherein the second wiring section comprises onecommon electrode section for opposite electrodes which is commonlyconnected to each of a plurality of the horizontal electric fieldforming opposite electrodes.
 12. A display comprising a substrate havinga plurality of bus lines, wherein a substrate for a display according toclaim 1 is used as the substrate.